AirHint found the following cheapest return flights from Calgary (YYC) to Athens (ATH) in September 2025 (see full year).

Return flights

28 Sep - 29 Oct	WestJet
29 Sep - 29 Oct	WestJet
14 Sep - 21 Sep	Porter Airlines (Canada) Ltd
28 Sep - 30 Oct	WestJet
30 Sep - 29 Oct	WestJet
05 Sep - 12 Sep	WestJet
28 Sep - 28 Oct	WestJet
29 Sep - 28 Oct	WestJet
19 Sep - 24 Sep	WestJet
11 Sep - 17 Sep	Porter Airlines (Canada) Ltd
24 Sep - 03 Oct	WestJet
22 Sep - 01 Oct	WestJet
30 Sep - 28 Oct	WestJet
13 Sep - 20 Sep	WestJet
01 Sep - 08 Sep	WestJet
24 Sep - 22 Oct	Condor
11 Sep - 28 Sep	WestJet

Also check the deals for one-way flights from Calgary to Athens in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Calgary to Athens in September from $689

Return flights